To calculate EBITDA analysts start with net earnings. To that earnings number, interest, taxes, depreciation, and amortization are added. EBITDA as a pre-interest number is a flow to all providers of capital.

Merck & Co. Inc.’s EBITDA increased from 2017 to 2018 and from 2018 to 2019.

If the company EV/EBITDA is lower then the EV/EBITDA of benchmark then company is relatively undervalued.
Otherwise, if the company EV/EBITDA is higher then the EV/EBITDA of benchmark then company is relatively overvalued.